It comes down to the design and parts quality not the price. You can get close with a very good integrated unit but it is difficult to design something with having the chassis limit your overall design. It can be done but then you might as well go the separate route at that point. If you are looking for a SS unit the Mark Levinson recent integrated unit can be purchased for under $6K for a B-stock. IMO it is the one to purchase versus everything mentioned above.
Happy Listening.